1. Pre-Algebra 11-2 Slope of a Line Warm-up Purple workbook – pg. 85 # 1 Need to be finished within the next 5 minutes Pictures or progress report

2. Pre-Algebra 11-2 Slope of a Line Learn to find the slope of a line

3. Pre-Algebra 11-2 Slope of a Line A linear equation shows the relationship of 2 variables in the form of a straight line. Every point on the line is a solution to the equation.

4. Pre-Algebra 11-2 Slope of a Line Slope can be 1.Positive - positive slope goes up to right. 2.Negative - negative slope goes up to the left 3.Zero – is a horizontal line. 4.Undefined – is a vertical slope

5. Pre-Algebra 11-2 Slope of a Line

6. Pre-Algebra 11-2 Slope of a Line

7. Pre-Algebra 11-2 Slope of a Line Linear equations have constant slope. Slope is calculated using the following ratio: vertical change horizontal change change in y change in x = Also known as RISE over RUN Rise indicates the # of units moved up or down on the “y axis” run indicates the # of units moved to the left or right on the “x-axis”

8. Pre-Algebra 11-2 Slope of a Line Find the slope of a line for the points (x 1, y 1 ) and (x 2, y 2 ) as follows: y2 – y1y2 – y1x2 – x1x2 – x1y2 – y1y2 – y1x2 – x1x2 – x1

9. Pre-Algebra 11-2 Slope of a Line Find the slope of the line that passes through (–2, –3) and (4, 6). Let (x 1, y 1 ) be (–2, –3) and (x 2, y 2 ) be (4, 6). 6 – (–3) 4 – (–2) 9 6 = The slope of the line that passes through (–2, –3) and (4, 6) is. 3 2 = y 2 – y 1 x 2 – x 1 3 2 =

10. Pre-Algebra 11-2 Slope of a Line 1 2 (3, 1)

11. Pre-Algebra 11-2 Slope of a Line Try This: Example 4 Continued 1 2 (1, 1)

12. Pre-Algebra 11-2 Slope of a Line Purple workbook – pg. 86

13. Pre-Algebra 11-2 Slope of a Line Homework out